Damper-operating device.



Elm-828,911. PATENTED AUG; 21, 1905.

E. H. WEAVER. E DAMPER OPERATING DEVICE.

APPLICATION FILED FEB- 13. 1906.

5%W a I i ATTOR/VES Tn: NORRIS PETERS cu, WASHINGTON, n. c.

UNITED STATES PATENT OFFICE.

DAMPER-OPERATING DEVICE.

Specification of Letters Patent.

Patented Aug. 21 1906.

Application filed February 13, 1906. Serial No. 300,910.

To all whom it may concern:

Be it known that I, EDWARD H. WEAVER,

a citizen of the United States, residing at Cal verton, in the county of Fauquier and State of Virginia, have invented a new and useful Damper-Operating Device, of which the following is a specification.

This invention relates to dam er-operating devices for cooking-stoves an it has for its object to simplify and improve the construction and operation of this class of devices and to present a simple and eflicient device whereby the damper or dampers of a cookingstove may be manipulated automatically at a predetermined time after the starting of the fire to obstruct the direct draft and to cause the products of combustion to circulate around the oven, so as to heat the latter.

With these and other ends in view, which will readily appear as the nature of the invention is better understood, the same consists in the improved construction and novel arrangement and combination of parts, which will be hereinafter fully described, and particularly pointed out in the claims.

In the accompanying drawings has been illustrated a simple and preferred form of the invention, it being, however, understood that no limitation is necessarily made to the precise structural details therein exhibited, but that changes, alterations, and modifications within the scope of the invention may be made when desired.

In the drawings, Figure 1 is a perspective view of acooking-stove to which the inven tion has been applied, parts having been broken away for the purpose of showing the construction more clearly. Fig. 2 is a sectional view taken on the plane indicated by the line 2 2 in Fig. 1. Fig. 3' is a detail front elevation.

Corresponding parts in the several figures are indicated throughout by similar characters of reference.

In the drawings there has been illustrated a cooking-stove 1 ,having a passage 2,through which the products of combustion may pass directly to the eXit-opening 3, said passage being provided with a damper 4, which is known as a direct-draft damper. A passage or opening 5 is also shown through which the products of combustion may pass in a circuitous course around the oven before reaching the final point of exit, said opening being provided with a damper 6, which is known as the oven-damper. The damper 6 has been shown as being carried by a rock shaft 7, having an arm 8, which operates through a loop or staple 9 upon the damper 4, so that when the rock-shaft 7 is operated to close the damper 6 the damper 4 will be thrown open, and vice versa. The rockshaft 7 extends forwardly through the stovecasing and is provided with a terminal crank 10, which has been shown as carrying a weight 11, the tendency of which is to oscillate the rock-shaft, so as to open the ovendamper and to close the direct-draft damper. Said dampers may thus be regarded as being gravity-operated, and it is obvious that a similar result may be attained by omitting the weight 11 and by establishing a proper relation between the weights of the dampers.

'12 designates an operating-rod, one end of which is loosely connected with the crank 10 of the rock-shaft 7. The opposite or free end of the operating-rod is supported in a guiding device or bracket, such as a staple 13, which has been shown as depending from the top plate 14 of the stove-casing, said staple or bracket being of such dimensions that the 0perating-rod 12 may move freely therein, laterally as well as longitudinally. The operating-rod 12 has a terminal downturned arm or finger 15, which is adapted to engage a lug 16, which has been shown as secured upon the oven-door 17. The latter may within the scope of the invention be so constructed as to be directly engaged by the depending finger 15. The operating-rod 12 is provided intermediate its ends with a projecting portion 18, which may be in the nature of a bulge or loop upon said operatingrod.

Supported upon the oven-door 17 is a casing 19, containing a spring-motor, such as a clockwork of very simple construction,which, however, as it forms no part of the present invention, has not been illustrated in detail, although a winding-post 20, whereby the motor may be wound, and an arbor 21, driven by the motor, appear in the drawings, it being understood that the arbor will be driven at a regular and predetermined speed. The arbor carries a hand 22, adjustable thereon, as by means of a set-screw 23, and the face of the motor-casing, which may be regarded as a dial, has been suitably graduated, as shown at 24, to enable the hand 22 to be adjusted accurately, the graduations being taken to indicate divisions of time.

When the oven-door is closed andthe opcrating-rod 12 is adjusted to place the finger 15 in engagement with the lug 16, the rockshaft 7 will be oscillated against the tension of its actuating-weight to open the directdraft damper and to close the oven-damper, and at the same time the projecting portion of the operating-rod 12 is disposed in the path of the hand 22, so that when the arbor 21 is rotated the hand will eventually engage the projection 18 and push the operating-rod until thefinger 15 becomes disengaged from the lug 16, when the rock-shaft 7 will be automatically oscillated under the impulse of the actuating-weight to reverse the position of the dampers-thatis, to close the directdraft damper and to open the oven-damper. This operation may be timed to occur within a certain period after the setting of the device by properly adjusting the hand 22 upon the arbor at the time of setting the device, as will be readily understood.

At the time of building a fire the directdraft damper is obviously opened in order that the requisite draft may be had. Frequently, however, it is forgotten to manipulate the dampers so as to throw the heat on the oven in time to heat the latter for baking purposes. When a stove is equipped with this improved damper-operating device, it is necessary, in order to open the direct-draft damper, that the oven-door must be shut and that the finger 15 of the operating-rod be placed in engagement with the lug 16 upon the oven-door. While doing this the operator will be surely reminded to wind the springmotor and to adjust the hand 22 to a suitable position where it will displace the operatin rod and operate the dampers at a suitab e time after the starting of the fire, the interval being capable of being very accurately aged according to the kind of fuel that is employed so as to enable the fire to gain a good headway before the direct-draft damper is closed. Even if it should be forgotten to wind the motor and to set the hand 22 the dampers will be automatically operated the very first time that the oven-door is thrown open for the purpose of testing the temperature of the oven, so that in any event the dampers will be automatically operated to efiect the heating of the oven. I

It is desired to be particularly understood that no limitation is made to the arrangement of dampers herein shown and described or to any particular arrangement of dampers, or to the use of a plurality of dampers, since in many stoves the necessary regulation is effected by means of a single damper, and the right is reserved to such obvious modifications as may be necessary to adapt the inven- 60 tion to various makes of stoves.

Having thus described the invention, what is claimed is 1. A gravity-actuated rock-shaft having a crank, a damper operated by the rock-shaft, an operating-rod connected with the crank and having a projecting portion, supporting means and retaining means for the free end of the rock-shaft, a driven shaft or arbor, and a hand adjustable upon said arbor and adapted to engage the projection upon the 0perat5 ing-rod.

2. A gravity-actuated damper-operating rock-shaft having a crank, an operating-rod connected with the crank and having a projecting portion and a finger, means for loosely supporting the free end of the operating-rod, means for engaging the finger ofthe latter to hold the rock-shaft against the tension of its gravityactuating means, a driven shaft or arbor, and a hand connected with said arbor to engage the projection upon the operatingrod.

3. In a cooking-stove, a damper-operating gravity-actuated rock-shaft having a crank, an operating-rod connected with the crank and having a finger at its free end, means for loosely supporting the free end of the operating-rod, and an oven-door having means for engaging thefinger of the operating-rod to retain the rock-shaft against the tension of its actuating means,

1. In a cooking-stove, a damper-operating gravity-actuating rock-shaft having a crank, an operating-rod connected with the crank, an oven-door, means for loosely supporting the free end of the operating-rod adjacent to the oven-door, means upon the latter for engaging the operating-rod to retain the rockshaft against the tension of its actuating means, and means carried by the oven-door for displacing the operating-rod from engagement therewith at a predetermined time.

5. In a cooking-stove, draft-regulating ,means including a damper and a damper-operating rock-shaft, means for actuating the rock-shaft to keep the direct-draft passage normally closed, means connected with the rock-shaft, to sustain the latter with the direct-draft damper in an open position said means including a lug or projection upon the oven-door of the stove, and spring-actuated means connected with the oven-door for dis placing-said supporting means.

In testimony that I claim the foregoing as my own I have hereto aifixed my signature in the presence of two witnesses.

EDWARD H. WEAVER,

Witnesses:

T. E. BARTENSTEIN, HUGH HAMILTON. 

